Answer:
The answer is A.
Step-by-step explanation:
Basically as it says, the first length is 5 more than the second and the third is 7 more than the first.
Answer:
1
Step-by-step explanation:

Remember that 
Plug it in:



Answer:
19.400
Step-by-step explanation:
19.400 equals out to 42769.67886386625